Flutter集成tflite_flutter_helper包时Android编译错误求助

问题现象 #

在全新Flutter项目中集成tflite_flutter和tflite_flutter_helper包后，编译时出现核心错误：

e: /Users/sangyoonhan/flutter/.pub-cache/hosted/pub.dartlang.org/tflite_flutter_helper-0.3.1/android/src/main/kotlin/com/tfliteflutter/tflite_flutter_helper/TfliteFlutterHelperPlugin.kt: (43, 1): Class 'TfliteFlutterHelperPlugin' is not abstract and does not implement abstract member public abstract fun onRequestPermissionsResult(p0: Int, p1: Array<(out) String!>, p2: IntArray): Boolean defined in io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener
e: /Users/sangyoonhan/flutter/.pub-cache/hosted/pub.dartlang.org/tflite_flutter_helper-0.3.1/android/src/main/kotlin/com/tfliteflutter/tflite_flutter_helper/TfliteFlutterHelperPlugin.kt: (143, 2): 'onRequestPermissionsResult' overrides nothing

原因分析 #

你用的tflite_flutter_helper: ^0.3.1版本太旧，和当前Flutter 3.3.8的Android插件API不兼容。新版本Flutter修改了PluginRegistry.RequestPermissionsResultListener接口里onRequestPermissionsResult方法的参数签名，旧插件的方法签名匹配不上，导致编译失败。

解决方案 #

1. 升级依赖包到兼容版本 #

直接更新pubspec.yaml里的tflite_flutter和tflite_flutter_helper到最新稳定版，示例如下：

dependencies:
  flutter:
    sdk: flutter
  camera: ^0.9.4+5
  image: ^3.1.0
  tflite_flutter: ^0.10.1
  tflite_flutter_helper: ^0.4.0
  path_provider: ^2.0.8

执行flutter pub get后重新编译项目，这是最推荐的解决方式。

2. 手动修改旧插件代码（临时方案） #

如果暂时不想升级，可以直接修改缓存里的插件代码：

1. 找到报错文件：/Users/sangyoonhan/flutter/.pub-cache/hosted/pub.dartlang.org/tflite_flutter_helper-0.3.1/android/src/main/kotlin/com/tfliteflutter/tflite_flutter_helper/TfliteFlutterHelperPlugin.kt
2. 找到onRequestPermissionsResult方法，把参数permissions的类型从Array<String>改成Array<out String>，修改后方法签名如下：

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray): Boolean {
    // 保留原有方法内容
    return cameraPlugin?.onRequestPermissionsResult(requestCode, permissions, grantResults) ?: false
}

3. 保存文件后重新编译项目。

3. 清理缓存后重新构建 #

如果上面的方法无效，执行以下命令清理缓存再尝试：

flutter clean
flutter pub get
flutter run

内容的提问来源于stack exchange，提问作者Flutter Boi